Pipe-cutter.



No. 729,816. r PATENTBD JUNE 2, 1903.

A. W. WARNOCK.

PI PE CUTTER. APPLICATION FILED NOV. 6, 1902.

no MODEL.

\rJwHzsscs: I

Q. 7% fl Patented June 2, 1903.

AMOS W. WARNOOK, OF BOSTON, MASSACHUSETTS.

PIPE-CUTTER.

$PECIFIOATION forming part of Letters Patent No. 729,816, dated June 2, 1903.

Application filed November 6. 1902. Serial No. 180,246- (No model.)

T on whom it may concern.-

Be it known that I, AMOS W. VVARNOGK, a citizen of the United States, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Pipe-Cutters, of which the following is a specification.

This invention relates to tools for cutting metallic pipe, said pipe being held 'immovs able in a vise or similar machine or instrument, the pipe being cut by swinging, preferably in an upward direction, the handle of the pipe-cutter.

The invention consists in a certain novel construction and arrangement of parts whereby the pipe is cut with greater ease and certainty, the movable jaw adjusted quickly, and the operation of the implement improved and rendered quicker.

The nature of the invention is fully described below and illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a pipe-cutter embodying my invention, showing a piece of pipe in section in position, a portion of the rod being broken out. Fig. 2 is a plan view of the same. Fig. 3 is a view of the under side, a portion of the rod being broken 0E. Fig. 4 is a longitudinal section taken on line 4, Fig. 2. Fig. 5 is a transverse section taken on line 5, Fig. 4. Fig. 6 represents a cuttingknife provided with four cutting edges. Fig. 7 is a View of a cutter provided with a single cutting edge. 7

Similar letters of reference indicate corresponding'parts.

ct represents the parallel sides, and a a, respectively, the front and rear ends ofa rectangular open metallic frame. The ends a a! are bored to receive the smooth portions of a round rod or handle-bar b, which is screwthreaded between said ends Within the frame. The handle-bar is held in position on one side of the end a, by a nut cand on the other side by a suitable shoulder formed by having the bar where it passes through the end a of smaller diameter than the main threaded portion, as shown in Fig. 4. The outer end of the handle-bar is provided with the round disk-shaped rigid handle 6, formed on its periphery with depressions or concave notches c for the purpose of aiding the hand in obaccommodate or facilitate the natural turn ofthe wrist.

Extending rearward from the frame and integral therewith is the tubular guide g, from which there extends the parallel ears It, said ears operating asla stationary jaw and sup-' porting, by means of'a suitable screw d in either of theholesf, a cutting-knife 70, below described.-

19 represents a movable jaw provided with the angle-shaped or other suitably-formed surface 1)" for engaging with a pipe 8, with the flanges p, which are seated on the upper side of the frame, and with the extension m,which is horizontally bored at m andextends down through the frame and beneath it bends rearward at n and is provided on opposite sides of its end with rollers o. The upper side of the bore 'lTt'JlS threaded to correspond with the screw-thread onthe rod b,while the under side is smooth, said bore being made somewhat larger in diameter than the threaded portion of the rod 1). The rollers o are of suitable diameter to bear against the under edge of the frame when the movable jaw is seated on the upper edge thereof.

The cutting-knife 7c is provided at its operative end with a notch u, termed a clearance, a blunt edge r, preferably slightly rounded and at a suitable angle to bear centrally against the pipe above the center thereof, and a cutting edge w, which is at an obtuse angle with the'lower edge of the cutter and projects upward into a cutting-point to, which is at an acute angle with the clearance a. This cutter may have two opposite operative cutting edges or operative portions, as in Figs. 1 and 4, or one, as shown in Fig. 7, or four radially arranged, as shown in Fig. 6.

In operation the pipe is placed between the cutting-knife and the jaw 13 and said jaw rocked orswung toward the cutter, such rocking being rendered possible by the size of the bore m and the smoothness of its bottom, and the jaw moved against thepipe, such movement being facilitated by the rollers o. The pipe is then forced snugly against the cutting-knife s by rotating the rod 1) by means of its handle e, which by means of its thread carries the movable jawp toward the knife. The knife then assumes the position shown in Fig. 1, such position being forced by the shape of the pipe, the dead-rest 1) bearing against the pipe above its center and the point 20' of the knife bearing against the pipe below its center. The pipe being held immovably in a vise, the handle 6 is swung up, with the etfect that while the dead-rest slips over the pipe and holds the cutter in position the cutting edge 20 w of the knife cuts the pipe, the notch u acting as a clearance.

It should be understood that as the knife is held pivotally on the pin or screw d it is forced by the pipe. itself into the position illtistratedi. 6., with the dead-rest bearing above the center and the cutting edge below the center-so that the k nife-pointcnts up toward the centerand is constantly held in the same relative position by the rest,which bears on the pipe.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

ll In a pipe-cutter, a slotted or open frame; a movable jaw adapted to slide on said frame; an extension projecting downward through said slot and rearward beneath the frame and adapted to bear against the under side of the frame when the pipe is held in position; a rod in engagement with the movable jaw and adapted to be disengaged and allow the jaw to rock when ,it is not engaging with a pipe; a stationary jaw rigidly connected with the frame; and a cutting-knife supported by the stationary jaw, substantially as described.

2. In a pipe-cutter, a slotted or open frame; the movable jaw 19 provided with the horizontally-bored downward projection m extending forward beneath and bearing against the under side of the frame when the jaw is engaging the pipe; a stationary jaw extending rigidly from the frame; and a rod extending through and having hearings in the frame and the bore on said extension, and with its portion inside the frame screwthreaded, said bore being somewhat larger in diameter than the threaded portion of the rod and being provided on its upper side with a screw-thread, whereby the stationary jaw is held rigidly in position when it is in operation but is free to be rocked out of engagement with the thread on the rod when the pipe is released, substantially asset forth.

3. In a pipecutter, thelongitudinally-slotted oropen frame a, a, a; the movablejaw p seated on said frame by means of the flanges p; the extension on horizontally bored at m, extending down through the frame, and bent rearward at at; suitable rollers supported by the portion at and bearing against the under side of the frame; the rigid jaw 7t extending from the frame; the rod 1) extending through said bore and having hearings in the frame, said rod being adapted to engage with the movable jaw when said movable jaw is in engagement with the pipe; and the disk-shaped handle 6 on the outer end of the rod, said handle being provided with the peripheral notches e, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

AMOS W. \VARNOCK.

Vitnesses:

HENRY W. \VILLIAMS, A. N. BONNEY.- 

